文献类型：期刊文献

英文题名：Chitosan modified Ti-PILC supported PdOx catalysts for coupling reactions of aryl halides with terminal alkynes

作者：Zheng, Xiu[1];Zhao, Jing[1];Liu, Qi[1];Xu, Mengdie[1];Yang, Shuai[1];Zeng, Minfeng[1];Qi, Chenze[1];Cao, Xingzhong[2];Wang, Baoyi[2]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, Zhejiang Key Lab Alternat Technol Fine Chem Proc, Shaoxing 312000, Peoples R China;[2]Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China

年份：2020

卷号：158

起止页码：67

外文期刊名：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES

收录：SCI-EXPANDED(收录号：WOS:000564491800007)、、WOS

基金：The authors acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 11875193), and Zhejiang Provincial Fundamental Public Welfare Research Project of China (Grant No. LGG18E030004).

语种：英文

外文关键词：Chitosan; Hybrid catalysts; Positron annihilation

外文摘要：Biopolymer of chitosan (CS) and titanium pillared clays (Ti-PILCs) have been combined in a hybrid as advanced supports for immobilization of PdOx=0,1 species to prepare novel PdOx=0,1@Ti-PILC/CS nano-composite catalysts. The Ti-PILC materials showed high specific surface areas and abundant meso-porous structure with many irregular pore channels caused by collapses of layered structure of clay during Ti pillaring process. Both CS chains and sub-nano sized PdOx particles were successfully incorporated into the pore channels of Ti-PILC, resulting in a decrease in both the specific surface areas and uniform distribution of pore size. Besides conventional methods characterizations, the strong interactions between PdOx species and Ti-PILC/CS support were further evidenced with positron annihilation lifetime spectroscopy studies. The resultant PdOx@Ti-PILC/CS catalyst was highly active for the coupling reactions of aryl halides with phenyl acetylenes. It was recyclable and gave excellent yield up to 13 runs with low leaching of Pd species. (c) 2020 Elsevier B.V. All rights reserved.